I have two tank raised percula clowns. I have added a bubble anenome.
Now that the aneome is in the clowns are acting different. One is swimming around the anenome looking at it getting close and seems drawn to it. I have heard that tank raised may not host the anenome.
What do you think the odds are ??

It's awsome that your clown is showing interest in your anemone already. My captive bred ocellaris acted like yours did and a few days later it was playing in the anemone.

It's a myth that captive bred clowns will NOT take an anemones as a host. Out of the 4 captive bred clowns i've had all of them have taken to my BTA. I'm not saying that all clowns take up a host, it's up to the individual clown. They might even ignore your anemone and choose a power head as a host. Even sometimes wild caught will not take a host, to each their own.

I have one tank bred ocellaris clown that remained a complete stranger to my BTA for several months, then one day just jumped right in. The anemone was in the tank first, maybe thats what took so long. I would think that if your fish show any interest, it will happen eventually.
Here is a picture.

I bought a pair of very small ocilleris clowns at the same time as I know you must buy in pairs. Well, one died after one week but the other is healthy and strong. He's been doing great for the past two months. Can I add another one at this point or will they kill each other. Also, on the topic of anemone for them. What is the best/hardiest kind?

Bluejam- Get a captive bred juvenile clownfish, that way you will be sure 99% that it's still young and hasn't gottent the chance to change into a female. If your clown has reached sexual maturity it's most likely has already changed into a female.

It's not a "must" to buy them in pairs. There are techiques to be used to get clowns to become bonded pairs when added seperate.

Bubble tip anemone is considered one of the easier anemone to care for.